Engine-Codes - Mazda - B13C3 MAZDA

B13C3 MAZDA - LF Control Unit

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3  What is this?
Table of contents

B13C3 MAZDA Possible Causes

  • Faulty LF Control Unit
  • LF Control Unit harness is open or shorted
  • LF Control Unit circuit poor electrical connection
  • Faulty Start Stop Unit

How is the B13C3 MAZDA code repair?

Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

Tech Notes

DTC B13C3-04: LF CONTROL UNIT INTERNAL MALFUNCTION
DTC B13C3-09: LF CONTROL UNIT MALFUNCTION
DTC B13C3-16: LF CONTROL UNIT POWER SUPPLY VOLTAGE LOW INPUT
DTC B13C3-29: COMMUNICATION ERROR BETWEEN STRAT STOP UNIT AND LF CONTROL UNIT

What is the cost to diagnose the B13C3 MAZDA code

Labor: 1.0

The cost to diagnose the B13C3 MAZDA code is 1.0 hour of labor. The auto repair labor rates vary widely across the country, and even within the same city. Most auto repairs shops charge between $75 and $150 per hour.
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Possible Symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)

B13C3 MAZDA Meaning

With the communication between the start stop unit and LF control unit being performed normally, there is no response from the LF control unit even though there is the signal transmission request from the start stop unit to the LF control unit, and the LF state signal becomes low.

More Information

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